Type-writing machine.



E. B. HESS.

TYPE WRITING MACHINE. APPLIOATION FILED n.zs, 1910.

1,009,514, Patented Nov. 21, 1911 2 SHEETS-SHEET 1.

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WIT/VESSES:

E. E. HESS.

TYE WRITING MACHINE. uzmcmzoxrum-AFAM.1910.

1,009,514, Patented N0v.21,11911.

2 SHEETS-SHEET Z,

STATES.

ArarEN@ oEEIe-E.

t EDWARD E. nnss.. E NEW remt. N. v.,'Ass1GNoB, 'ro E oYAL TYPEWEITER COMPANY.

4 oENEWvYoRK; N. Y., A eonronArIoN or NEW JERsEr:

i it may concern; i

Be. itg known: that I,- EnwAnD IB. .Hl-:ssJ a citizen of the United States of Americae residing in the 'borough 'of Manhattan, city,

county, and. State of New York, have mvented certain Improvements in 'lype-lifritf specification.

This invention comprises certain improvements 1n back space devices operating on -the ingl lllaehines, ,of which the following 1s a depression of apkey in the'lreyboardl to set the rack. back one tooth or' space .on each4 depression. l

-A-lathe accompanying drawing; Figure l is' a V'vertical'longitudinal ection; Fig. 2, a detail rear elevation showing the back space feed-devices in normalinoperative position.; Fi-g. 3, a detail-elevation showing said devices. moved tofa position-to engage the rack andready to operate it; Fig. .4.

.a like view showing the: same parts inthe final -positioi'r after .the rack hasbeenset back ouet'opthffand l"ig. 5, a detail plan viewshowmg a'modlfication.

Adjacentlthe left hand sideof the machine is-a back space key lever e mountedl to turn on a. vbearingA or transverse pivot shaft. b and'havmg-,an upwardly extending arm e.

' This arm-l. connected with the frontcnd of alink vcprovidednvith an adjusting t rn buckle c and having its rear end connected to thevertical arm of a bell crank lever cl mounted to rook about .a stud bearing d and having applied toit acoiledv spring (Z2 'vertical arm -ofthe bellcrank lever rearthe-reaction of/vhich tends .to throw the zontally `disposed lever, its free end adjacent. the side of the machine Vhaving applied to it a Acoiled reaction spring i, that tends to throw the inner or opposite endof the lever upwardly. This latter end ofthe lever is forked, one of the forks being formed by an oset plate I4.' bolted to the lever at It. The end ofthe lever is formed Witha tooth '-TYPEWEITING MACHINE.

Specification of Letters Patent Alipiication inea Apru 2s, 1910. serial No. 558,125.

Patented Nov. 2 1, 19.11.

or point la that projects upwardly towardl the rack On the side of the lever below the teeth is a laterally projecting pin h that travels in cam way formed in a plate l' secured' to the frame or bracket m 1n which is the .bea-ring of the escape. wheel shaft 11. rlhis -cam plate lies in' a plano transverse to the machine and parallel therewith in which lies the rocking back space' l'evc-r "11. and is em`- 4braced by the forked ends ofthe leven', ln the posit-lon shown 1n fFig. 2, the reaction of spring 'l tends to throw'upwardly the end of the back 'space lever hf. and maintains the piu L thereon in contact with the wall of the cam plate which prevents its 'risingi When, however, as in Fig. 2l, helll crank lever f is rocked by the upward thrust' ot link Y'. its vertically disposedarm moves tmvard -the center of the machine,-that 'is -towEn-d the shafto the esca-pe wheel, and the' pin It* v on the back space lever `rides upwardly ou the-'wall of the' cam. assuming the position indicated in Fig. 3 at which time the point, or tooth 0% the lever will have entered a space between 'two of tht` teeth of the rack. Further depression of the back space lacy carries the parts tothe position indicated in Fig. .4 where the end thrust of the lever has set Ath'e rack back one tooth or letter space. On assuming such position, the projection h* has traveled alongr the horizontal upper wall of the cam. On release of' the key lever, the parts return to normal'p'osition indicated 1n Fig. 2. 'lhe cam etlccts precision of movement that`insures accurate operation.

In order .to prevent, during the back spacingoperation, jump of the rac-lc that might. disengage it from the vescapcu'u-,ut pinion, tliere'is provided a lmzk'which, as the stress of the back space lever is exerted upon the rack to set ithack one tooth, is brought into enga gement with the upper face of the rack to preventits lifting. This loek,.however`, in normal position is suiciently far removed from or so disengaged from it. as to' permit its -mani1n|lation for ordinary releasing operations. This part of the invention may be embodied in the 'following manner. Pivoted at 0' on the side ofeam plate is an uprightarm o offset. as seen in Fig. 3

and having at its top a laterallyprojeeting arm oz the free end of which is by preference curved, being bent somewhat downwardly toward the rack andl faced with a strip of leather or other appropriate'fmaterial o. A coiled spring 71 havingone-erid attached'to the arm o and the other to the cam plate r tends to draw the arm o to'the right "as viewed in Figs. 2, 3 and 4 which are views from the real-'of the machine. The arm is therefore held in normal position of inactivity shown in Figs. 2 and 3. When, however, the final cndwise movement is imparted to the back space pawl h to bring it into the final position indicated in Fi". 4, the end of the jaw h coming in contact with lever arm o rocks it toward the shaft n of the escape wheel and thereby brings the part o3 into engagement with the top ot' the rack as in Fig. 4'tl1us affording a lock or limit thatV prevents accidental' disengagement of the rack from the escapement pinion during back spacing operations. The form of "the invention which has now been described is an. embodiment thereof which experience 'has shown to 'be practical-'and efficient.

Variations thereof may be made byv those skilled in the art without departing from the principles ot' the invention. One modification has been shown in Fig. 5. There the pin It*l is shown as havingr an enlarged 4or flange head h between the flange of which and the side of pawl It the camplate is em-l braced. The flange also acts to operate the lever arm 0 as already described'.

l claim-z l. Back space mechanism comprising a transversely arranged back space paw, a back space key lever in the key board, an operative connection by which the pawl is moved emlwise on depression of said lever, a cam plate embraced by the end ot' saidpawl and having an interior cam wa y, a projection on the side of the pawl guided by the wallsA of said cam way, a rack into engagement. with which the end ot' the pawl isgnided by said cam Vay, alock carried by a movable arm arranged in the path of the pawland engaged by thc latter in its endwise movement to shift the rack to thereby bring the lock -in position with respect to the rack to prevent its disengagement from the escalwment pinion.

2; Back space mechanism comprising an ende-'isc movable back spacing pawl, a camway ct-m-.ti-o-lling the movement of its free end, a. rack into engagement with which the pawt is guided by the cam-way, a rocking part pivoted on awxed part of the frame, a1

foperatlve connctionbet'iveii 'fsaidi- A'rocking part and the baclr'sp'aci'n'g pawl, a down wardlywvextending link operatively con neeted' atl its upper end to said rocking par so as to move the pawl to engage.the` rack 'abell Icrank lever to one arm of whichthi lower endl of lsaid link is jointed, a for wardly extending link jointed to the othei arm of said beli crank, a back spacesliey and means whereby the latter link is ac tuated on depression of said key.

3. Back space mechanism lcomprising-z` transversely arranged pi-votedubackspace pawl,a back spacing lever, an operativ( connection b v which the pawl is-moved endwise on actuation of said lever, coperating cam parts for directing themovement. of the vpawl, a spring whose reactionholdsvsaie cam parts in Contact., the cam part-s being si related that one may move a\vay .roni-the other when the tension of saidspring is overcon'nf, and a rack into engagement with which the end of the pawl isUyielding-ly guided b v said camv part-s. i

-4. Back space Vmechanism comprising a transversely arranged pivoted -fbackspace pawl` a back spacing lever, an operativeconnevtion by which the pawl is moved endwise on actuation of said lever, coperat- `ing cam parts for directing the, movement oflthe pawl', a spring whose reaction holds said cam parts m Contact, the -cam parts 'being so related that one may moverawav `from the otherwhen Vthe tension of .said spring is overeon'ie, a rack into engagementwith which the end of the pawl is-,yieldingly guided by said cam parts. a lockte prevent disengagement of the rack from thecscapement pini-on. an arm carrying said'lock, pivoted upon a fixed axis and lyingl in the path of the endwise movable p'awl, and a spring that. normally retracts said arm and holds the lock out of operative relation to the rack, whereby when the pawl is moved cndwise-'to engage and back space thefraek the lock is brought into position to pre-vent the rack from dfiscngaging its pinion.

Tn testimony whereof, I 'have hereunto subscribedr my name.

EDWARD n; nnss.'

Vitnessesz L. C. MYERS. A. J. Sin-annals. 

